Telephony.



M. L. JOHNSON.

TELEPHONY. APPLIOATIOH FILED D110. 4, 1912.

Patented 0 0m, 1913.

3 SHBETS-SHEET l.

ENTQR MORTON LJ JOHNSON HY ATT @RNEY Patented 0013.7,1913.

3 SHEETS-SHEE'1' 2.

I NTGR MORTON L. JOHNSON ATTQRNEY M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED no.4, 1912 Patented Oct. 7, 1913.

3 SHEETSSHEBT 3.

RH mm mm M.

WITNESSES ATTQRNEY Worm .llilfl .ll.

ICAGQ, XLLlll-UIS, T COBWIN TELEPHONE MAN- j-Lhl iii, C 1 CH'JICAGG,ILLINOIS, A COEPGRATION OF ILLINOIS.

TELEPHONE fif'b all whomii only concern:

3 it known that I. lllou'rcw ll. JOHNSON? 'n ol' tho United litiiics,reciding otxg'o, in ihc coonly of Cook and State. of lllinois, hiivoinvented a certain now and l lnmrovchienl; in 'i clophony, of whichdOllOll lllg is a full, clcmr ooncisc and doscriplion, roil ercncc beinghad to tho :1 cfil'l'ipz drawings, forming a purl; of

on. i

LClOll relnlcs to those telephone loi'ns inciudi aolcphonc lincsextending our SlllllE-lCllbQl'bl stations; to an exchange a; sonic oi?which stations arc l=1,:cz1l; d doviccs inquiring operation by call.-ing' ibors icnscs by called subsoi'ibcrrs in order to completeconnection belwcv calling and callod Subscribers, thci'o bcing moons atl'ho subscribors stations coopen with those devices and ogcroblc by r::o-zmding coll. d subscribers, link conn li-C-L'l-Ol'tl al the exchange,for conversation, switching mocha]. n for brculiio lclophonic connectionboom-con cull.-

y llcd stallions for telephonic cnrroot ii'u'orcsscd upon calling lines21'". culling uniting" linos in inlioololls electromagnetic mechanismgovv 1 Qinod l by tho aforesaid devices oi caning Stiloquippcdlihcrewith in. cooocrnlion "l2 alfiorcsaid means ill sl-Ldions oi rcforopcral'ing swii'ching mechanism to complete conlion holiwe'cn callingand called stations, moans for completing telephonic con- ,tion bclzwccncalling and called stal ions iior iclcyhonic current impressed uponcallcd lines at called stations when lclophonic connection brolicnbetween culling and called Milli-i015 for currcnl impressed upon cullinglines at culling slot-ions.

In my copcnding appliculioi'i Serial No. l 86%; lilod December l, 1912-l have illuslrnlod' oporzilor controlled means for com biing thecompletion of coi'incc'tious bclwccn coiling and called siiilions so asnot to roquirc operation by calling culmoribcrs of tho dcvicce lociiiedat sl'ulions employed for i'hc mrposo of charging calling subscriberswilh connections.

in my present inicntion I employ moans whorcby calling si.ib:5o1'ibcrsmay signal an :Wernlor whoso function ii. is lo 9155 upon propricby ofpor nilling guch calling subiber to have free conneolion. in thobroil-rived cinhodimcnt of tho immr .Specificaiion of Letters lalent.

Poizcntod om, Tl, i913.

Serial No. Win 5.

tion link connectors are employed which the coiling SlllJSCllbGlS areenabled to use for. establishing connection between calling and calledslalions and which are provided with equipment, controlled by callingand called stations, for the purposo of preventing coniplctc connectionsbetween calling and called stations until offer the calling party hasoperated the device at his station that will charge 5 ich calling partywith tho conneclion to be effected. This cquipmcnl is sup pleinonl'cd bymeans also governed by the calling subscriber whereby his line may bemitoinziticolly oxlcndcd into connection with the operator provided forthe purpose stated.

I will cxplain my invonlion more -fully by rcforoncc to the accompanyingdrawings in which l igurcs l, 2 and 3, taken collectively, with the.conductors terminating at the right, hand end of Fig. 1 in alinemcntWilh lhc conduciors lorminiicing at the left hand side of Fig. 2 and theconductors terminating at the right hand sidc of Fig. 2 in zilincincntwith lhc conductors terminating at the left hand .sidc of l ig. 3,illustrzitc tho preferred form of telephone cxchzingc system employingnutonhitic means for extending culling lines, tho particular oystcmillustrated being one in which the extensions applied to calling linesare also uulomatioally connected with called lines though the inventionis not to be limited to systems employing this latter step.

The prepayment of prochnrgc station A, of which there are of course wnumber, and lho culled slnli-zwn ll which may or may not be a prepaymentor n'cchru'ggo slulion, nro illusl'rntcd as being caoh provided with thousual telephone equipment including a tolc phone rcrciver switch hook 1having a nor-- lllill contact for connccl'ing the line sides through asignal bell. 2 and a condenser 23 when the tclcphono receiver 4% uponils rawilch hoolc. The switch book has an alter- 11;z'i19 Contactwhereby the ielcphonc receiver 4 and telephone transmitter 5 areincludcd norms the line sides when tho telephone rccciver is removedfrom its switch hook. isc-inning that the party at station A is 1111-tuiting a. call, lihc receiver 4- at the calling station A is rec of itsswitch hook to permit said switch hook metalhcally to connect theilidfis of the calling" line whereby circuit 1s:

established through the selector switch line relay (3 by circuitconnections which are apparent. Calling subscriber, after having removedhis telephone receiver from its s\\'itch hook, operates his dialmechanism, which is illustrated in diagraannatic form, the normallyclosed circuit interrupting switch 7 whereby a circuit of the magnet (3is intermittently opened for the purpose of causing its armature switchto be vibrated at a predetermined rate of speed. \Vhen this armatureswitch is attracted it establishes a circuit through the sluggishlyoperating re lay S. hen the armature oi relay 6 drops back (the armatureof relay 8 still being up, owing to the sluggishness of this relay) acircuit is established traceable from the grounded armature switch ofrelay 6 through its normal contact, the lower armature switch of relay 8and its alternate contact, the vertical magnet- 9, the sluggishlyoperating relay 10, the side switch wiper 11 in its normal position, tothe grounded battery 12. The vertical magnet raises the wipers 13, 1. 1and 15 to the level of a bank of waiting contacts that includes waitingcontacts pertainingto a desired link connector which is to beautomatically connected with the calling line for the purpose ofextending the calling line into connection with a called line. When thedesired level of waiting contacts has been attained, the circuit of theprivate magnet 16, which was closed upon the energization of relay 10 atthe armature switch of this relay, is opened due to the maintainedattraction of the armature switch of relay 6, and the circuitof thevertical magnet 9 is also opened at said armature switch of relay 6. Thevertical magnet 9 therefore ceases to elevate the wipers 13, 1.4, 15while the private magnet- 16 serves to step the side switch wipers 11and 17 to their second positions. When the side switch wiper 11 is putin its second position circuit for the rotary magnet 18 is closedthrough the interrupter 19 whereby the wipers 13, 14C and 15 are steppedaround until the wiper 1e engages an ungrounded contact. When thisungrounde'd contact is encountered circuit for the private magnet 16,which was again closed upon the initial operation. of the rotary magnet18, is opened whereby the side switch wipers 11 and 17 are moved totheir final position, the side switch wiper 11 in being moved to thisfinal position opening the circuit of the rotary magnet 18 whereby thewipers 13, l t and 15 are brought to rest with the wipers l3 and 15 inconnection with the talking sides of the automatically selected. linkconnector that is to constitute the extension of the calling line. I

It is understood that there are a. plurality of the link selectorswitches being described for a group of telephone lines and that theengaged by wipers of these switches are provided with waiting contactsthat are individual to the link connectors, each link connector having nailing contacts in the different switches and which are similarlypositioned, tne similarly positioned waiting contacts being in multipleconnection. When the wiper 17 has been brought to its final position itconnects the wiper 14 with ground by way oi the upper armature switch ofthe sluggishly operating relay 8, this ground being substituted foranother ground which will later appear. in this way the contact theactuated wiper 14 is grounded and similarly positioned contacts in otherswitches of the same group are also grounded owing to their multiplerelation with the aforesaid waiting contact so that other switchescannot select the link connectm' selected by the switch under deseription. When the side switch wiper 11 is in its third position acircuit is established for the switchingrelay 20 which may be tracedfrom the grounded battery 12, the wiper 11 in its final position, therelay 20, the upper armature switch of relay 8 and its contact toground, this ground later being replaced by another ground as w ll laterappear. The relay 20, now being energized, connects the wipers 13 and 15with the sides of the calling line so that these calling line sides areextended into connection with the talking sides of the selected linkconnector. At the right hand end of Fig. l the wipers 13, 14- and 15 areindicated in dotted lines. These are the same wipers which are shown infull lines just to the left and are thus illustrated for the purpose ofshowing these-wipers in another level. The level. illustrated inconnection with the wipers 13, 1.4 and 15 where shown by dotted lines isone of a number of levels that are used in ordinary automatic orsemi-automatic practice. The level shown in connection with the wipers13,14 and 15 is an especially provided level for one of the purposes ofthe invention andis employed to enable call ing subscribers to becomeconnected with called subscribers without having to operate anyprepayment or precharge device.

It will be first assumed that the calling subscriber is' not making anemergency call but desires to secure connection with a called subscriberas usual. In such event the wipers 13, 14 and 15 will be brought to somelevel in which are provided waiting contacts that, in. the embodiment ofthe invention illustrated, constitute terminals of an idle linkconnector extending to a connector switch illustrated at C, under theassumption that the system is an automatic system, the connector-switchC being operated by the callingsubscribers circuit interrupter 7 in theestablishment of connection between calling and called subscribers forbringing ornets the connector switch into assethecclled line, theoperation fell known b sf illed in the art is description thereof willnot be furnished but reference may be had to Eritish Patent 1298 ltlltland to an Derenters Telephonai- 09y, 53G, on understanding of suchconnector switches. I

l hen the wipers 18', i l. and have been brought to rest circuit isestablished which is traceable from the grounded battery 12, the upperwindin oi" the relay i'ilfthe upand its alternate contact, the upperarmature switch oi relay 23 and its nornial contact the circuitinterinpter 7' at the calling ststions the telephone bridge .at thecalling station, the lower armature switch of relay 23 and its normalcontact, the intermediate armature switch of relay 20 and its alternatecinittuzt the Wiper and the contact engaged thereby, the lower windingoi d'iii erei. al magnet 22, the lower winding of magnet Q1, to ground.

if'il ts its armature switches, the upper ariiosture switch or thisrelay closing circuit for the siuggishly operating relay 1% whereby theuppermost armature switch of the sluggishly operating relay piecesground upon the contact engaged oy the wiper 14: in lieu of the groundnow removed at the unper armature switch of sluggishly operrting relay 0consequent upon the operation it the relay 20. The lower armature switchof relay 21 establishes a bridge connection between the talking sidesor" the link connector extending to connector switch G, which bride'sconnection may be traced from the lower talking side oi the linkconnector,

a until the called subscriber onds whereupon the connection of the n itscircuit with the polarized relay will to use the armature of the relayto c con t for the o n he s slur operate, c; lied di iring the lugsubscribcfis interr the relay 2? being gro nded battery 12., l Z, thelower armaits contact, the relay 21 and its The circuit ino l 4 v i.coniplished in the lisuel manner, and as the conneetorswitch is, adevice wh ch 15 The cumulatively wound relay 21 now at-' terruptionsoccasioned by the calling suloscribcrs interrupter 7 are effective inopen ing and closing the circuit of the line relay 26 of the connectorswitch 0 at the lower armature switch of relay 21, this relay 21 beingize consequent upon the operation of the interrupter 7. During theseimpulses the bridge containing the polarized relay (which may be aresistance of five hundred ohms) is shunted by the low resistance bridgetraceable from the upper armature switch of relay 2? and its alternatecontact, the lower armature switch of relay 21 and its engaged contact,to the lower armature switch of relay 27 to bring the relay 26 intocontrol of the interrupter 2'2. The wipers of the connector switch areconsequently lo-- cated in the proper level and are moved about untilthey engage waiting contacts of the called line, all as will be wellunderstood by those skilled in the art/ When the called subscriberresponds the back bridge relay 28 of the connector switch C is includedin circuit, the two upper armstureswitches of this back bridge relayengaging their alternate contacts to reverse the connection of thebattery 12 in its circuit with the relay 25 to cause the armature switchof this relay 25 to be shifted. i l lien this switch is shifted circuitfor the relay 29 is established from the grounded battery 12 throughthis relay 29, the armature switch of the polarized relay 25' and itsthen engaged contact, the lower armature switch of relay 30 to itsgrounded contact. The up per armature switches of relay 29 are providedwith connectednorinal contacts and the lower armature switches of thisrelay are also provided with connected normal contacts.

The top and bottom armature switches are connected with the portion ofthe selected link connector extending to the connector switch C and theintermediate armature switches are connected with theportions oi thelink connector extending to the waiting" contacts engaged by the wipersl3 and 15 of the link selector switch. Thus when the relay 29 isdcenergizcd the link connector intervening between the link selectorswitch and the connector switch is tclephonically completed exceptingfor the gap established at the relay 27 during the impulses employed foroperating the connector switch 0. When the relay 29 is energized theconnections between its armature switches established by their normalcontacts are broken so that at these points telephonic connectionbetween the calling and called lines is open.- The alternate contacts ofthe intermediate armature switches of relay 25) are connected through oninduction coil 31 whereby this induction coil is serially connected withthe calling line. This induction intermittently energized and dener 'llOcoil 31 is in inductive relation with a primary 32 included in a localcircuit that contains a telephone transmitter The transmitter is to beoperated by a telephone receiver 34 which is included in a conductorthat terminates in the alternate contacts of the top and bottom armatureswitches of relay 29 whereby this receiver 34 is connected with thecalled subscriber when the relay 29 is energized. A second- I ary 35 isincluded in series with the receiver 3%, this secondary havinga primary36 that is included in a local circuit with a transmitter 37 into whicha talking device 38 speaks. This talking device'may'be in the nature ofa phonograph and the record of the phonograph may be suited to thepurpose of the system. For example, the phonograph may speak l Vhat isyour number '?ltegister please, suthcient time intervening between thereproductions of these phrases within which the called subscriber maygive his number and the calling subscriber may deposit his coin Bothsubscribers hear these phrases as will be ap parent. The announcement ofthe nuinbei made by the called party will be relayed from thereceiver34. to the transmitter 33 and from the induction coil. 82 to the induc:tion coil. 31 whereby the calling party will hear the number announcedby the called party. Any current impressed. upon the line at the callingstation will not however be relayed to the called station since thetrans mitter 83 is incapable of relaying these voice currents impressedat the calling station by Way of the receiver 8%. When the callingsubscriber hears the phrases automatically announced by the phonographhe knows that 9. called subscriber has answered and when he hears thecalled subscribcrs number" the calling subscriber will know that theproper party has answered and will thereupqn deposit the coin l/Vhen thecoin 39 is deposited a circuit is,inomentarily established which istraceable from the grounded contact of the switch 40, the companioncontact of this switch, the switch hook 1, thence by connections whichare apparent to the wiper l5 and from this wiper 15 by connections whichare apparent to the lower coil oi the differential relay 22, to thegrounded coil of the cumulatively wound relay 21. By connections whichare equally obvious the switch 40 is also included in circuit' with theupper winding of the differential relay 22. The coils otthe relay arethus thrown out of balance so that this relay is energized to attractits armature switch to complete the circuit of the relay 3O traceablefrom the grounded battery 12 the winding of relay 30, the lower armatureswitch of differential relay 22, the now attracted armature switch ofrelay ll (which is energized consequent upon' the closure of l theswitch of the polarized relay 25) to ground. The relay 30 establishesaloclnng circuit for itself traceable from the battery 12, its upperarmature switch and its'engaged contact to the upper grounded armatureswitch of relay 24. When the relay 30 is energized. circuit for therelay 29 is opened be restored to normal in a manner well.

known by those familiar with automatic telephone practice.

. Assuming that the calling subscriber has an emergency or special call,say for a doctoror tor a fire alarm station and has no.

coin to operate his switch e0, or in case the calling subscriber wishesto use the tele phone service for the companys business such callingsubscriber will, by suitable Ina;

nipulation. of his interrupter 7, select the leyel' illustrated inassociation with the wipers 13, let and 15 as shown in full lines iiFig; 1. Such. a level of waiting contacts has contact buttons whichconstitute ter nilnals of link connectors that extend to selectorswitches such as illustrated at D (which may be of the usual type ofselector sw tches as employed in pure automatic practice and which neednot therefore be described in detail) and which are employed N forextending the calling line into connection with an. idle operatorsposition, this opcratofis position corresponding to the called station Bwhich was previously described as being connected with the calling lineby the connector switch C. The wipers of the selected selector switch Dand until the wiper 42 engages an ungrounded waiting contact, suchcontact being ungrounded when the corresponding operator is idle. Whenthe wipers l3 and at rest upon corresponding waiting contacts, the relays5 is placed in bridge of the calling line and is consequentlyenergized. The upper and grounded ari'nature switch of the relay 4-5places ground upon the button engaged by the ,wiper 42 so that any suchwiper of any other selector switch I) will not remain in engagement witha similarly positioned contact button in multiple connection with thebutton thus grounded whereby the same operator is guarded from selectionby more than one selector switch. The lower armature switch of the relayl5, when attracted, establishes a circuit through the signal device 46to attract the attention of the idle operator who depresses herlistening key t? to bring her telephone set 48 into circuit relationwith the calling subscriber. lit the operetor sscerteins that thecalling subscriber is entitled to free use of a telephone connectionsuch operator will efi'ect or permit the extension or" the calling lineinto connection with the line of the station desired by the callingsubscriber.

In the embodiment of the invention illustrated the various lines areprovided with spring jacks 419 located before such operator and the linkconnector conductors that en able the operators to eii'ect connectionbetween their telephones and the telephones of calling subscribers areextended into connection with terminal plugs 50 which may be insertedwithin jocks e9 for iurpose of completing connection between ceiling andcalled subscribers. The link connector terminating in the plug" 50 maybe provided with the usual supervisory apparatus which need not bedescribed and may be provided with the usual ringing outfit forsignaling the called subscribers bell, all as is well understood bythose skilled in the art.

The operator ,mey, from time to time, bridge her telephone into theestziblished circuit to make sure that the calling s'ubscriber is usingthe established circiiit properly within his privilege.

I believe it to be broadly neiv with me to provide system of the classindicated in which there is provided at speciel operators position forrenking connections between calling and called stations whether prepaidor prechsrge connections are estsb lishcd with the aid of the automaticequipinent illustrated or by any other means, semi-automatic or manual.

While I have herein shown and particularly described the preferredembodiment oi? my invention, 1 do not wish to be limited to the precisedetails of construction and cir cuit arrangement shown as changes mayreadily be made Without departing" from the spirit of the invention, but

"bus having described my inve "on claim as new and desire to secure byletters .Patent the following I s 1. A. telephone exchange systemincludi telephone lines extending: from subscribers stations to anexchange at some of which stations are located devices requirineoperation by ceiling subscribers after responses by called subscribersin order to complete connection between calling and called subscribers,there being meens at the subscribers stations cooperating With thesedevices and operable by responding celled subscribers; link connectorsat the exchange "for uniting: lines in conversation: switching:mechanism associated with said linlr connectors for iJl'QRlCUlfitelephonic connection between celling and called stations for telephoniccurrent impressed upon ceiling); lines st calling tions; electromagneticmechanism by the aforesaid equipped therewith in cooperation Witl.aforesaid means at stations of res;

culled subscribers for operating;- ssid switch and completing conncc andcelled nddr controlled linlr connectors connection between Cilillllf}:

J? Li. 1 L l l ins" mechanism between calling tionsl one tor forestablishing and called stations independently o vices requiring"operation by calling sub scribers sitter responses by celledsubscribmeans whereby calling;- subscribers have telephonic connectionwith an opera independently of his device requiringopera tion in orecharged or prepaid connec end electro-njingnetic SNliCill-fltfl' meshfor automatically conncctinn the sddi linlr connectors With calling 1 2.i1 telephone exchange Qt telephone lines est-ending i .l'OHi stations toan exchange some t stations are located devices re irinr eoerstion bycalling; subscriliiers in order to complete connection between celliiand. celled subscribers: link connectors it; the ohene'e for unitinglines in conversuti 7 switching mechanism associated with. saidlinlr'connect as for iflltftkillfi' telephonic connection. bets ecnceiling and called stations for telephonic current impressed noon on innlines at culling stations; electro-- um new mechanism operated by thesilo s ceiling stations equipped here with tor o 'ierntine the Swliillii'lff ineciu nisni and to ceniiiletc connection between on l celledStet-ions: udtlitiiinal on itliOl' trt lc l nit connectors for in c inection between culling st 7 celled stations independently of requiringon erstion by selling subscribers after resnons-es by celledsubscribers; :meons whereby cellsubscribers i my have tele honieconnection with-an operator independently of his device requiring;onerzi'tion imnrecbnrzed prepaid connections; and electroieticswitchinf' mechanism to:- suto 'rm'ti necting' the odditionnl iinlreminent calling" lines 8. A tele "one exchunn'e s vsteni inciu telenuonel etrtcndi 535 from stations nu exchange at some t t stations arelocated devices requir' tion by calling subscrib" otter culledsubscribers in order to comp ncction between csllinn endculled sut ers,there b ins st the subserioers stations coii 'ieretingr with t devices(int i operable by responding celled si'lbscribers;

uni ting e for and called stations for telephonic current tion inprecharged or prepaid connections;

means whereby the operator may supervise uncharged connections betweencalling and called stations; and electromagnetic switching mechanism forautomatically connecting the additional link connectors with callinglines.

4. A telephone exchange system including telephone lines extending fromsubscribers stations to an exchange at some of which stations arelocated devices requiring operation by calling subscribers in order tocomplete connection between calling and calledlsubscribers; linkconnectors at the exchange for uniting lines in conversation; switchingmechanism associated with said link connectors for breaking telephonicconnection between calling and called stations for telephoniccurrent'impressed upon calling lines at calling stations;electro-magnetic mechanism operated by the aforesaid devices at callingstations equipped therewith for operating the switching mechanism tocomplete connection between calling and -alled stations; additionaloperator controlled link connectors for establishing connection betweencalling and called stations independently of the devices requiringoperation by calling subscribers after responses, by called subscribers;means whereby calling subscribers may have telephonic connection with anoperator independently of his device requiring operation in prechargedor prepaid connections; mea'nswhereby the operator may superviseuncharged connections between calling and called stations; andelectro-magnetic switching mechanism for automatically connecting theadditional link connectors with callin lines.

5. X telephone exchange system including telephone lines extending fromsubscribers stations to an exchange at some of which.

stations are located devices requiring operation by calling subscribersafter responses by called subscribers in order to complete connectionbetween calling and called subscribers, there being means at thesubscribers r stations cooperating with these devices and operable byresponding called subscribers; link connectors at the exchange foruniting lines in conversation; switching mechanism associated with saidlink connectors for breaking telephonic connection between calling andcalled stations for telephonic current impressed upon calling lines atcalling stations; electro-magnetic mechanism governed by the aforesaiddevices at calling stations equipped therewith in cooperation with theaforesaid means at stations of responding called subscribers foroperating said switching mechanism and completing connection betweencalling and called stations; additional operator cont-rolled linkconnectors for establishing connection between calling and calledstations independently of the devices requiring operation by callingsubscribers after responses by called subscribers; means whereby callingsubscribers may have telephonic connection with an operatorindependently of his device requiring operation in prccharged or prepaidconnections; and electro-magnetic switching mechanism for automaticallyconnecting the aforesaid link connectors with calling lines.

G. A telephone exchange system including telephone lines extending-fromsubscribers stations to an exchange at some of which stations arelocated devices requiring opera-- tion by calling subscribers in orderto complete connection between calling and called subscribers; linkconnectors at the exchange for uniting lines in conversation; switchingmechanism associated with. said link connectors for breaking telephonicconnection between ca-lling andcalled stations for telephonic currentimpressed upon calling lines at calling stations; electromagneticmechanism operated by the aforesaid devices at calling stations equippedtherewith for operating the switching mechanism to complete connectionbetween calling and called stations; additional operator controlled linkconnectors for establishing connection between calling and calledstations independently of the devices requiring operation by callingsubscribers after responses by called subscribers; means whereby callingsubscribers may have telephonic connection with an operatorindependently of his device requiring operation in preelia'rged orprepaid connections; and electro-magnetic switching mechanism forautomatically con necting theaforesaid link connectors with callinglines.

7. A telephone exchange system including telephone lines extending fromsubscribers stations to an exchange at some of which stations arelocated devices requiring-operation by calling subscribers afterresponses byicalled subscribers in order to complete connection betweencalling and called subto compLi ion.

associated Anemia sii swng means era'tm able b @rs; link ccnnectors atin convcrsarion:

( ted man s ale 1m.

1 A. ctr0- 4;- it L ulpped.

oresa-ld tinned C I? J ascribe adfii may have 1 between cahmg and ml0113; mam

swi'tcimin AQCUOH b operation 1 116 901161112 called subs perv :11

ilnprossa Lions overned b the neiii-ms for b phonic (nu-yen 0 at calling5%.

1mm calling stations a 0per 1 tions ms 15 operating completing so calieci stations; trnflmi link motion bei t fflfiiOu callin by called.subscriber fibers Y wlth an operator inde' device raquirin or m'eepaidconnect am? may 5 turns betwee is swit ne t

